EP1070990A1 - Composition photosensible et procédé de fabrication d'une plaque d'impression lithographique - Google Patents
Composition photosensible et procédé de fabrication d'une plaque d'impression lithographique Download PDFInfo
- Publication number
- EP1070990A1 EP1070990A1 EP00115002A EP00115002A EP1070990A1 EP 1070990 A1 EP1070990 A1 EP 1070990A1 EP 00115002 A EP00115002 A EP 00115002A EP 00115002 A EP00115002 A EP 00115002A EP 1070990 A1 EP1070990 A1 EP 1070990A1
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- EP
- European Patent Office
- Prior art keywords
- group
- groups
- pigment
- photosensitive composition
- printing plate
- Prior art date
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- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
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- 239000001023 inorganic pigment Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
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- VIAPGVLSJAGIPY-UHFFFAOYSA-N n-(trimethylsilylmethyl)aniline Chemical class C[Si](C)(C)CNC1=CC=CC=C1 VIAPGVLSJAGIPY-UHFFFAOYSA-N 0.000 description 1
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- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000004010 onium ions Chemical class 0.000 description 1
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- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 231100000434 photosensitization Toxicity 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
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- 229920000768 polyamine Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- CPNGPNLZQNNVQM-UHFFFAOYSA-N pteridine Chemical compound N1=CN=CC2=NC=CN=C21 CPNGPNLZQNNVQM-UHFFFAOYSA-N 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- 229940079877 pyrogallol Drugs 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- JWVCLYRUEFBMGU-UHFFFAOYSA-N quinazoline Chemical compound N1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-N 0.000 description 1
- OVYWMEWYEJLIER-UHFFFAOYSA-N quinolin-6-ol Chemical compound N1=CC=CC2=CC(O)=CC=C21 OVYWMEWYEJLIER-UHFFFAOYSA-N 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
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- 230000002829 reductive effect Effects 0.000 description 1
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- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000003548 sec-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 description 1
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- 238000005728 strengthening Methods 0.000 description 1
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- 125000005504 styryl group Chemical group 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical compound NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 150000003557 thiazoles Chemical class 0.000 description 1
- CBDKQYKMCICBOF-UHFFFAOYSA-N thiazoline Chemical compound C1CN=CS1 CBDKQYKMCICBOF-UHFFFAOYSA-N 0.000 description 1
- 150000003549 thiazolines Chemical class 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000002813 thiocarbonyl group Chemical group *C(*)=S 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000005424 tosyloxy group Chemical group S(=O)(=O)(C1=CC=C(C)C=C1)O* 0.000 description 1
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
- 125000005369 trialkoxysilyl group Chemical group 0.000 description 1
- 125000005409 triarylsulfonium group Chemical group 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- ZTWTYVWXUKTLCP-UHFFFAOYSA-N vinylphosphonic acid Chemical class OP(O)(=O)C=C ZTWTYVWXUKTLCP-UHFFFAOYSA-N 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
- 239000001043 yellow dye Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
- G03F7/029—Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur
Definitions
- the present invention relates to a photosensitive composition having excellent stability and handling characteristics as well as high sensitivity, and to an image formation method using such a composition.
- the invention relates to a photosensitive composition and an image formation method suitably applicable to a lithographic printing plate precursor material which enables platemaking with scanning exposure based on digital signals.
- PS plate presensitized plate
- ink-receptive photopolymer layer provided thereon
- lithographic printing plate In a conventional method for making such a printing plate, mask exposure (area exposure) is generally carried out via a lith film, and then the non-imaging area is dissolved and removed with a developer.
- a photopolymerizable composition having a high photosensitization speed hereinafter also referred to as a photosensitive composition
- an ink-receptive photopolymer layer hereinafter also referred to as a photosensitive layer
- a hydrophilic support As a method of enabling the utilization of scanning exposure in case of making a lithographic printing plate, the structure that a photopolymerizable composition having a high photosensitization speed (hereinafter also referred to as a photosensitive composition) is incorporated in an ink-receptive photopolymer layer (hereinafter also referred to as a photosensitive layer) provided on a hydrophilic support was proposed, and the lithographic plate precursors having such a structure have already been on the market. Those plate precursors are simple in development processing, and provide desirable plate-making and printing performances, including high resolution, excellent inking properties, a long press life and high scum resistance.
- the photosensitive composition having ink receptivity is basically constituted of an ethylenically unsaturated compound and a photopolymirization initiator. Further, a binder resin can be contained therein, if needed. Such a composition forms images by a mechanism that the photopolymerization initiator absorbs light to produce active radicals, and these radicals set off the addition polymerization of the ethylenically unsaturated compound to render the photosensitive layer insoluble.
- visible light sources of long wavelengths such as Ar laser (488 nm) and FD-YAG laser (532 nm)
- Ar laser (488 nm) and FD-YAG laser (532 nm) have been employed, but there has been a desire to increase the productivity by writing at a higher speed.
- the writing at a higher speed is not yet realized because the output of light sources usable therefor is not sufficiently high and the usable plate precursors also don't have sufficiently high sensitivity.
- the conventional systems are disadvantageous in that, as they are designed so as to respond to Ar laser (488 nm) or FD-YAG laser (532 nm), the photosensitive materials used therefor is required to have high sensitivity in the vicinity of 500 nm. As a result, it is necessary to carry out all the operations, including those for taking out a plate from a cardboard package, loading a plate setter in a cassette and inserting a plate in a plate setter, under a red safelight, so that the workability is considerably low. Therefore, it has been desired to make it possible to handle plates under daylight.
- the techniques to obtain a photosensitive composition suitable for laser scanning and having high productivity and excellent handling properties under daylight have been extensively longed for in the imaging field. And it is expected to apply such techniques to the image formation by, e.g., photo-molding, holography or color hard copy, and to the field for the production of electronic materials, such as photoresist.
- a main object of the invention is to construct a CTP system that can achieve excellent productivity, operation suitability and economical efficiency. More specifically, what the invention is mainly aiming at is providing a photosensitive composition having high sensitivity at the oscillation wavelengths of inexpensive short-wavelength semiconductor laser devices and capable of being handled also under bright safelight, and a method for image formation using the composition.
- a first problem for completion of the invention consists in acquisition of sensitivity high enough to enable high-speed scanning exposure in the wavelength region of 350 nm to 450 nm. For solution of such a problem, it is necessary to search for an appropriate photo-initiation system. We have now found that the sensitivity sufficient in a practical sense can be achieved when a titanocene compound is employed and, if necessary, in combination with a sensitizing dye.
- the usefulness of a titanocene compound-containing photo-initiation system as a photopolymerizable composition suitable for scanning exposure is disclosed, e.g., in JP-B-4-47680 (the term "JP-B" as used herein means an "examined Japanese patent publication").
- the photo-initiation system comprising the combinations of carbomerocyanine dyes with titanocene are disclosed in JP-A-9-328505, JP-A-8-272096 and JP-A-8-262715 (the term "JP-A” as used herein means an "unexamined published Japanese patent application),
- the photopolymerizing composition comprising a photoreducing dye and a titanocene in combination with a specified polymerizing monomer is disclosed in JP-A-4-221958
- the photo-initiation systems comprising the combinations of titanocene with particular aminobenzilideneketone dyes are disclosed in JP-A-4-194857, JP-A-6-295061, JP-A-7-84863, JP-A-220755, JP-A-9-80750 and JP-A-9-236913
- the photo-initiation systems comprising the combinations of titanocene with particular coumarin dyes are disclosed in JP-A-4-184344, JP-A-7-43896
- the pigment usable in the invention is required to be dispersed into a photosensitive composition in a state that, viewed microscopically, the pigment and other components are mixed inhomogeneously.
- the pigment is dispersed in the form of fine grains having an average grain size smaller than about 5 ⁇ m.
- other coloring agents e.g., dyes which are soluble in organic solvents to form a molecular dispersion in a photosensitive composition and homogeneously compatible with other components on the molecular level
- the fog generation at long wavelengths was rather aggravated, or the sensitivities at short wavelengths were considerably lowered.
- the use of pigments which do not have the optical characteristic that the transmittance at 500 nm is relatively lower than that at 400 nm lowers considerably the sensitivities at short wavelengths.
- the photosensitive composition according to the invention is described below in detail.
- the pigment usable as Component (iii) of the present photosensitive composition is illustrated below. This component is most important to the present photosensitive composition and required to have an optical characteristic such that the transmittance at 500 nm is relatively lower than the transmittance at 400 nm.
- the pigments used as Component (iii) in the invention have no particular restrictions so far as they have an optical characteristic that the transmittance at 500 nm is relatively lower than the transmittance at 400 nm.
- the optical characteristics of pigments can be controlled by properly selecting the chemical structures and the dispersed conditions (including the grain size and the state of dilution) of coloring materials as constituents of the pigments.
- the optical characteristics of pigments can be examined with ease, e.g., by forming a pigment-dispersed film on an optically transparent support and measuring the transmittance of the film with a general-purpose spectrophotometer.
- the transmittance of the pigment can be determined as the reciprocal of the reflectance measured by the method of regular reflection measurement or diffuse reflection measurement.
- Suitable examples of a pigment used in the invention are illustrated below in terms of C.I. Number described in Colour Index , Third Edition, published by The Society of Dyes and Colourists.
- the coloring compounds as constituents of pigments assume a state of molecular dispersion (solution), but not in a state of solid dispersion, when incorporated in the photosensitive layer of a lithographic printing plate precursor, they cause an adverse effect, such as an increase in fog or desensitization.
- the pigments of the kind which cause such an adverse effect it is desirable to employ the pigments of the kind which cause such an adverse effect to the least possible extent.
- the pigments suitable for the invention include azo pigments, perylene pigments, pyrazoloquinazolone pigments, pyrazoloquinazolone pigments, aminoanthraquinone pigments, quinacridone pigments, acidic dye lake pigments and basic dye lake pigments.
- azo pigments, acidic dye lake pigments, pyrazoloquinazolone pigments and quinacridone pigments are preferred over the other pigments.
- the pigments after syntheses are generally dried in a variety of ways, and then supplied. In most cases, the pigments are separated from an aqueous medium, dried and then supplied in the form of powder. The drying of water requires a great latent heat of evaporation, so that great thermal energy is applied during the pulverization of a pigment by drying. As a result, the pigment usually forms an aggregate (secondary grains) into which primary grains gather.
- the pigment It is not easy to disperse the pigment forming such an aggregate in the form of fine grains.
- a resin usable for such a purpose mention may be made of binding resins as recited below.
- the flushing treatment and the kneading method using a kneader, an extruder, a ball mill or a two-rod or three-rod roll mill can be adopted. Of these treatments, the flushing treatment and the kneading method using a two-rod or three-rod roll mill are more suitable for fine pulverization of the pigment.
- the flushing treatment is a method of treating a pigment with a resin, which usually comprises mixing an aqueous dispersion of pigment with a solution of resin in a water-immiscible solvent to extract the pigment from the aqueous medium into the organic medium.
- the pigment undergoes no drying treatment, and so the pigment can be prevented from aggregating and the dispersion thereof becomes easy.
- the treatment of a pigment by the kneading method using a two-rod or three-rod roll mill comprises mixing the pigment with a resin or a resin solution and kneading the resultant mixture while imposing a high shear (shearing stress) thereon. In this kneading process, the resin coating is formed on the pigment surface, and thereby the aggregated pigment grains are dispersed into primary grains via aggregates of lower orders.
- a pigment processed by previously treating with, e.g., acrylic resin, vinyl chloride-vinyl acetate resin, maleic acid resin, ethyl cellulose resin or nitrocellulose resin.
- the suitable form such a processed pigment can take is the form of powder, paste, pellet or paste, in which the pigment and the resin are homogeneously dispersed. Additionally, it is undesirable for the processed pigment to assume the form of unequal clusters by gelation of the resin.
- the dispersion of fine pigment grains having the desired grain size distribution can be prepared as follows: In the first place, the pigment is subjected to a flushing treatment or kneaded with a binding resin by means of a kneader, an extruder, a ball mill or a two-rod or three-rod roll mill. In accordance with a desirable kneading method, a solvent is added to the pigment and the resin, mixed homogeneously therewith, and then kneaded with a two-rod or three-rod roll mill, if necessary, under heating to fully familiarize the pigment with the binding resin. Thus, a uniformly colored matter is obtained.
- the thus treated pigment is mixed with other constituents including the pigment dispersant for use in the invention, and then subjected to wet dispersion (primary dispersion). Then again, the dispersion obtained undergoes wet dispersion using more minute beads (secondary dispersion) till the desired grain size distribution is achieved.
- the grains having the desired average size and size distribution can be obtained by fractionating the dispersion obtained by wet dispersion by centrifugation, or removing coarse grains therefrom by decantation.
- Carrying out the forgoing kneading process and dispersing process in the presence of a dispersant, such as a tertiary amine compound, is advantageous for attaining the grain size distribution intended by the invention, because the formation and dispersion of finely grained pigment can be promoted by the presence of such a dispersant.
- a dispersant such as a tertiary amine compound
- the tertiary amine compound containing at least one polymeric group is well suited for the foregoing purpose.
- the tertiary amine compound can have, any group may be used as long as it contains at least one polymeric moiety.
- the lower alkyleneoxy groups are preferred as the polymeric group.
- Such a lower alkyleneoxy group includes polyoxyethylene and polyoxypropylene, preferably a block copolymer of polyoxyethylene and polyoxypropylene.
- the number of these polymeric groups attached to a tertiary amine may be any of 1, 2 and 3.
- pigment dispersants and surfactants can be added for the purpose of enhancing the dispersibility of the pigments.
- these dispersants can be used many kinds of compounds, including phthalocyanine derivatives (e.g., EFKA-745, trade name, a product of Morishita Sangyo); cationic surfactants, such as organosiloxane polymer, KP341 (trade name, a product of Shin-Etsu Chemical Co., Ltd.), (meth)acrylic acid polymers, Polyflow No. 75, No. 90 and No.
- phthalocyanine derivatives e.g., EFKA-745, trade name, a product of Morishita Sangyo
- cationic surfactants such as organosiloxane polymer, KP341 (trade name, a product of Shin-Etsu Chemical Co., Ltd.), (meth)acrylic acid polymers, Polyflow No. 75, No. 90 and No.
- nonionic surfactants such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, polyethylene glycol dilaurate, polyethylene glycol distearate and sorbitan fatty acid ester; fluorine-containing surfactants, such as Eftop EF301, EF303 and EF352 (trade names, products of Shin-Akita Kasei), Megafac F171, F172 and F173 (trade names, products of Dai-Nippon Ink & Chemicals, Inc.), and Fluorad FC430 and FC431 (trade names, products of Sumitomo 3M), Asahi Guard AG710, Surflon S382, SC-101, SC-
- the average grain size of the pigment is very important.
- the pigment has a large average grain size, it causes undesirable light scattering.
- the photosensitive material containing such a pigment has a low transmittance, and so the light necessary for photopolymerization cannot reach to the inside of the photosensitive composition.
- the scattering is serious especially when light of short wavelengths is used as a light source. Accordingly, in the case of the photosensitive compositions intended for the use of a light source of relatively short wavelengths as in the invention, it is desirable that the average grain size of the pigment be as small as possible.
- the transmittance drop arising from the light scattering dependant on the grain size has considerable influence.
- the transmittance at 400 nm is lowered so long as the pigment grains are large in size; as a result, a decrease in real sensitivity of the photosensitive composition is brought about.
- the pigment too small in grain size tends to have poor dispersion stability, thereby arising undesirable troubles, e.g., aggregation and precipitation, when incorporated in a photosensitive composition. From these viewpoints, it is desirable for the present pigment to have its average grain size in the range of 0.01 to 0.7 ⁇ m, preferably 0.01 to 0.4 ⁇ m.
- the proportion of grains having sizes of no greater than 0.4 ⁇ m be at least 70 weight %, preferably 80 weight %, to the total grains and the average grain size be from 0.01 to 0.4 ⁇ m, preferably from 0.02 to 0.35 ⁇ m.
- the upper limit thereof is set so that no significant decrease in polymerization reactivity is caused in the photosensitive composition by the use of the pigment and, when the photosensitive composition is applied to a lithographic printing plate precursor, the pigment used therein causes no noticeable decrease in the development processability of the plate precursor.
- the lower limit of the amount of pigment used is set so that the pigment used has sufficient effect on the improvement in fogging characteristic of the photosensitive composition. These limits depend on the optical characteristics of each individual pigment.
- the amount of pigment used is generally from 0.001 to 5 g/m 2 , preferably from 0.05 to 3 g/m 2 , particularly preferably from 0.1 to 2 g/m 2 .
- excellent fogging characteristic can be obtained when the absorbance of the photosensitive layer at 500 nm, which is attributed to the pigment incorporated therein, is at least 0.1, preferably at least 0.3, particularly preferably at least 0.5.
- the photosensitive layer having high sensitivity can be obtained by dispersing a pigment in the presence of a polymer having an aliphatic double bond in the main chain or any of side chains.
- the proposals hitherto made for the use of pigments in a photopolymerization system can be found, e.g., in JP-A-10-282647 and JP-A-9-230601.
- the titanocene compounds used as a component essential for the present photosensitive composition may be any of known titanocene compounds as far as they can produce active species upon exposure to light, if needed, in the presence of sensitizing dyes as mention hereinafter.
- Such titanocene compounds can be selected properly from the known compounds as disclosed in JP-A-59-152396, JP-A-61-151197, JP-A-63-41483, JP-A-63-41484, JP-A-2-249, JP-A-2-291, JP-A-3-27393, JP-A-3-12403 and JP-A-6-41170.
- the titanocene compounds usable in the invention include di(cyclopentadienyl)-Ti-dichloride, di(cyclopentadienyl)-Ti-bisphenyl, di(cyclopentadienyl)-Ti-bis(2,3,4,5,6-pentafluorophen-1-yl), di(cyclopentadienyl)-Ti-bis(2,3,5,6-tetrafluorophen-1-yl), di(cyclopentadienyl) -Ti-bis(2,4,6-trifluorophen-1-yl), di(cyclopentadienyl)-Ti-bis(2,6-difluorophen-1-yl), di(cyclopentadienyl)-Ti-bis(2,4-difluorophen-1-yl), di(methylcyclopentadientyl)-Ti-bis(2,3,4,5,6-pentafluorophen-1-yl),
- the titanocene compounds as recited above can undergo various chemical modifications for improving characteristics of the photosensitive layer.
- a modification method usable therein include the binding to a sensitizing dye as mentioned hereinafter, an addition polymerizing unsaturated compound or another active agent part, the introduction of a hydrophilic moiety, the introduction of a substituent group for enhancing the compatibility and inhibiting crystals from separating out, the introduction of a substituent group for raising the adhesiveness, and the polymer formation.
- titanocene compounds can be selected properly depending on the efficiency design for a photosensitive material to which they are applied. For instance, the combined use of two or more compounds can increase the compatibility with other contituents of the foregoing photosensitive layer.
- the use of titanocene compounds in a large amount is advantageous from the viewpoint of sensitivity.
- Sufficient sensitivity can be achieved by using the titanocene compounds in an amount of 0.5 to 80 parts by weight, preferably 1 to 50 parts by weight, per 100 parts by weight of the total constituents of the photosensitive layer.
- titanocene compounds When the photosensitive composition is handled under a yellow or white light, on the other hand, it is desirable to use titanocene compounds in a small amount from the viewpoint of fog generation by light of wavelengths around 500 nm. For instance, even when the amount of titanocene compounds used is reduced to 6 parts by weight or below, further to 1.9 parts by weight or below, furthermore to 1.4 parts by weight or below, satisfactory sensitivity can be attained by using the titanocene compounds in combination with the sensitizing dyes as described hereinafter to raise the sensitivity of the photoinitiation system.
- addition polymerizable compound namely the addition polymerizable compounds containing at least one ethylenic unsaturated double bond in each molecule (hereinafter simply referred to as "addition polymerizable compound”), which is third in importance to the invention, are illustrated below.
- the addition polymerizable compound (ii) as an essential component of the present photosensitive composition is selected from the compounds having at least one, preferably at least two, terminal ethylenic unsaturated bond per molecule.
- the group of such compounds is widely known in this industrial field, and they can be used in the invention without any particular limitations. These compounds can take any of chemical forms, including a monomer, a prepolymer, such as a dimer, a trimer and an oligomer, a mixture thereof and a copolymer thereof.
- Examples of a solo monomer and monomers constituting a copolymer include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isochrotonic acid, maleic acid), esters thereof and amides thereof, preferably esters produced from unsaturated carboxylic acids and aliphatic polyhydric alcohols, and amides produced from unsaturated carboxylic acids and aliphatic polyamine compounds.
- unsaturated carboxylic acids e.g., acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isochrotonic acid, maleic acid
- esters thereof and amides thereof preferably esters produced from unsaturated carboxylic acids and aliphatic polyhydric alcohols, and amides produced from unsaturated carboxylic acids and aliphatic polyamine compounds.
- esters or amides of unsaturated carboxylic acids having nucleophilic substituents, such as hydroxyl, amino and mercapto groups, and monofunctional or polyfunctional isocyanates or epoxides, and dehydrocondensation products prepared from the foregoing esters or amides and monofunctional or polyfunctional carboxylic acids are also suitable for the addition polymerizable compound (ii).
- the addition products prepared from unsaturated carboxylic acid esters or amides having electrophilic substitutents, such as isocyanato and epoxy groups, and monofunctional or polyfunctional alcohols, amines or thiols, and substitution products prepared from unsaturated carboxylic acid esters or amides having eliminable groups, such as halogen and tosyloxy groups, and monofunctional or polyfunctional alcohols, amines or thiols are also used to advantage.
- the unsaturated carboxylic acid esters or amides having electrophilic substitutents such as isocyanato and epoxy groups
- monofunctional or polyfunctional alcohols, amines or thiols substitution products prepared from unsaturated carboxylic acid esters or amides having eliminable groups, such as halogen and tosyloxy groups, and monofunctional or polyfunctional alcohols, amines or thiols
- substitution products prepared from unsaturated carboxylic acid esters or amides having eliminable groups such as halogen and tos
- Examples of an ester monomer formed from an aliphatic polyhydric alcohol and unsubstituted carboxylic acid include acrylic acid esters, such as ethylene glycol diacrylate, triethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, propylene glyocl diacrylate, propylene glycol diacrylate, neopentyl glyocl diacrylate, trimethylolpropane triacrylate, trimethylolpropane tri(acryloyloxypropyl) ether, trimethylolethane triacrylate, hexanediol diacrylate, 1,4-cyclohexanediol diacrylatae, tetraethylene glycol diacrylate, pentaerythritol diacrylate, pentaerythiritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol
- esters As other examples of esters, the aliphatic alcohol esters disclosed in JP-B-46-27926, JP-B-5147334 andA-57-196231, the esters having aromatic skeletons disclosed in JP-A-59-5240, JP-A-5241 and JP-A-2-226149, and the amino group-containing esters disclosed in JP-A-1-165613 can be suitably employed.
- ester monomers as recited above can be use as mixture of two or more thereof.
- amide monomers formed from aliphatic polyamide compounds and unsaturated carboxylic acids include methylenebis(acrylic amide), methylenebis(methacrylic amide), 1,6-hexamethylenebis(acrylic amide), 1,6-hexamethylenebis-(methacrylic amide), diethylenetriaminetris(acrylic amide), xylylenebis(acrylic amide) and xylylenebis(methacrylic amide).
- addition polymerizable urethane compounds produced by utilizing the addition reaction of an isocyanate and a hydroxyl group are suitably used.
- urethane acrylates disclosed in JP-A-51-37193, JP-B-2-32293 and JP-B-2-16765 and the ethylene oxide skeleton-containing urethane compounds disclosed in JP-B-58-49860, JP-B-56-17654, JP-B-62-39417 and JP-B-62-39418 are also suitable.
- suitable addition polymerizable compounds mention may be made of the polyfunctional acrylates and methacrylates as disclosed in JP-A-48-64183, JP-B-49-43191 and JP-B-52-30490, such as polyester acrylates and epoxy acrylates produced by the reaction of epoxy resins with (meth)acrylic acid.
- the particular unsaturated compounds disclosed in JP-B-46-43946, JP-B-1-40337 and JP-B-1-40336, and the vinylphosphonic acid compounds disclosed in JP-A-2-25493 are also usable. In some cases, it is appropriate to introduce the perfluoroalkyl group-containing structures disclosed in JP-A-61-22048.
- addition polymerizable compounds can be chosen arbitrarily so far as the properties designed for the finished photosensitive material are attained thereby. More specifically, the determination of those factors are made taking the following viewpoints into consideration.
- the sensitization speed it is desirable for the structure to be high in unsaturated group content per molecule and, in many cases, it is preferable to be bifunctional or above.
- the addition polymerizable compounds In order to heighten the strength of the image area, or the cured film, it is desirable for the addition polymerizable compounds to be trifunctional or above.
- the compatibility of addition polymerizable compounds with other components in the photosensitive layer constitute other important factors in their selection and the directions as to how to use them. For instance, it is possible to increase the compatibility by the use of low-purity compounds or the combined use of two or more compounds.
- the present photosensitive composition is used for the photosensitive layer of a lithographic printing plate precursor, it is likely that the compounds having particular structures are selected for the purpose of enhancing the adhesiveness of the photosensitive layer to a support and an overcoat layer as mentioned hereinafter.
- the proportion of addition polymerizable compounds in the photosensitive layer it is advantageous from the viewpoint of sensitivity to incorporate them in higher proportions.
- their incorporation in too high proportions brings troubles, such that it causes undesirable phase separation, renders the photosensitive layer tacky to bring troubles in the production process (e.g., defective production arising from transfer and adhesion of components in the photosensitive material), and gives rise to precipitates in the developer.
- the suitable proportion of addition polymerizable compounds is, in many cases, from 5 to 80 weight %, preferably from 25 to 75 weight %, to the total components in the photosensitive composition.
- the addition polymerizable compounds may be used alone or in combination of two or more thereof.
- addition polymerizable compounds As to the other directions for using addition polymerizable compounds, it is possible to select their structures, compounding proportions and addition amount properly taking into account the extent of inhibition of polymerization by oxygen, resolution, fogging tendency, change in refractive index, and surface tackiness.
- the layer structure having an undercoat or a final coat may be taken, and the method of providing such coats may be adopted.
- photosensitive composition may further be contained other components suitable for its end use purpose and production method.
- sensitizing dyes for the purpose of increasing the sensitivity.
- the resulting combination is referred to as a photo-initiation system.
- the sensitizing dyes suitable for the foregoing purpose are those having a light absorption characteristic that they exhibit greater absorbance at 400 nm than at 500 nm when incorporated in the photosensitive composition.
- the sensitizing dyes employed more effectively for the foregoing purpose are those having a spectral sensitivity characteristic that they have their maximal sensitization wavelengths in the wavelength range shorter than 430 nm and longer than 300 nm, preferably shorter than 430 nm and longer than 350 nm. Any sensitizing dyes can be used in the invention as far as they have the aforementioned characteristics.
- sensitizing dyes having those characteristics include merocyanine dyes represented by the following formula (1), styryl dyes represented by the following formula (2), benzopyrans and coumarins represented by the following formula (3), aromatic ketones represented by the following formula (4) and anthracenes represented by the following formula (5): (wherein A represents a sulfur atom or NR 1 , R 1 represents a univalent nonmetal atomic group, Y represents a nonmetal atomic group forming a dye's basic nucleus in association with the adjacent A and the adjacent carbon atom, and X 1 and X 2 each represent a univalent nonmetal atomic group or they combine with each other to complete a dye's acidic nulceus) (wherein X 1 and X 2 have the same meanings as those in formula (1) respectively, and each of R 2 to R 6 represents a univalent nonmetal atomic group, but it is preferable that at least one of them represents an electron-donating substituent group having a negative Hammett'
- X 1 and X 2 have the same meanings as those in formula (1) respectively, and each of R7 to R12 represents a univalent nonmetal atomic group) (wherein Ar 1 represents an unsubstituted or substituted aryl or heteroaryl group, and R 13 represents a univalent nonmetal atomic group, preferably an aryl or heteroaryl group, or it combines with Ar 1 to form a ring) (wherein X 3 , X 4 and R 14 to R 21 each represent a univalent nonmetal atomic group, but it is desirable that X 1 and X 2 each be an electron-donating group having a negative ⁇ value).
- Suitable examples of a univalent nonmetal atomic group represented by each of X 1 , X 2 and R 1 to R 21 include a hydrogen atom, alkyl groups (such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, hexadecyl group, octadecyl group, eicosyl group, isopropyl group, isobutyl grouop, s-butyl group, t-butyl group, isopentyl group, neopentyl grouop, 1-methylbutyl group, isohexyl group, 2-ethylhexyl group, 2-methylhexyl group, cyclohexyl group, cycl
- Examples of the basic nucleus of a dye represented by formula (1), which Y forms in association with the adjacent A and the adjacent carbon atom, include 5-, 6- or 7-membered nitrogen- or sulfur-containing heterocyclic rings, preferably 5- or 6-membered heterocyclic rings.
- the nitrogen-containing heterocyclic rings suitably used for such a basic nucleus include all of those known to constitute the basic nuclei of merocyanine dyes as described, e.g., in L.G. Brooker et al., J. Am. Chem. Soc. , 73, 5326-5358 (1951) and the references cited therein.
- thiazoles such as thiazole, 4-methylthiazole, 4-phenylthiazole, 5-methylthiazole, 5-phenylthiazole, 4,5-dimethylthiazole, 4,5-diphenylthiazole, 4,5-di(p-methoxyphenylthiazole), and 4-(2-thienyl)thiazole
- benzothiazoles such as benzothiazole, 4-chlorobenzothiazole, 5-chlorobenzothiazole, 6-chlorobenzothiazole, 7-chlorobenzothiazole, 4-methylbenzothiazole, 5-methylbenzothiazole, 6-methylbenzothiazole, 5-bromobenzothiazole, 4-phenylbenzothiazole, 5-phenylbenzothiazole, 4-methoxybenzothiazole, 5-methoxybenzothiazole, 6-methoxybenzothiazole, 5-iodobenzo
- the sulfur-containing heterocyclic rings suitable for the dye's basic nucleus are, e.g., the dithiol partial structures in the dyes disclosed in JP-A-3-296759.
- Examples of such partial structures include benzodithiols (such as benzodithiol, 5-t-butylbenzodithiol, and 5-methylbenzodithiol), naphthodithiols (such as naphtho[1,2]dithiol, and naphtho[2,1]dithiol) and dithiols (such as 4,5-dimethnyldithiols, 4-phenyldithiols, 4-methoxycarbonyldithiols, 4,5-dimethoxycarbonylbenzodithiols, 4,5-ditrifluoromethyldithiol, 4,5-dicyanodithiol, 4-methoxycrbonylmethyldithio
- heterocyclic rings constitutes the partial structure of the basic skeleton in each sensitizing dye, it is introduced in the form of a substituent group of alkylidene type which is lower in unsaturation degree by one.
- the benzothiazole skeleton is introduced in the form of a 3-substituted-2(3H)-benzothiazolylidene group.
- sensitizing dyes represented by formulae (1) to (5) respectively are illustrated below, but the sensitizing dyes usable in the invention should not be construed as being limited to these examples.
- the present photosensitive composition for the photosensitive layer of a lithographic printing plate precursor, it is possible to further make various chemical modifications to the sensitizing dyes as recited above for the purpose of improving the characteristics of the sensitive layer.
- the increase in film strength of the exposed photosensitive layer and the prevention of unnecessary separation of the sensitizing dyes as recited above from the exposed photosensitive layer can be effected when the addition polymerizable compound structure as mentioned above (such as acryloyl or methacryloyl group) is linked to the dyes by a covalent, ionic or hydrogen bond.
- the sensitizing dye as recited above bind to the titanocene compound as recited above and a radical generation part (such as a reduction decomposable part, e.g., halogenated alkyl, onium, peroxide or biimidazole, or an oxidation cleavable part, e.g., borate, amine, trimethylsilylmethyl, carboxymethyl, carbonyl or imine).
- a radical generation part such as a reduction decomposable part, e.g., halogenated alkyl, onium, peroxide or biimidazole, or an oxidation cleavable part, e.g., borate, amine, trimethylsilylmethyl, carboxymethyl, carbonyl or imine.
- a hydrophilic part such as an acidic group or a polar group, including carboxyl group or an ester thereof, sulfonic acid group or an ester thereof, and an ethyleneoxide group
- a hydrophilic part is effective in heightening the suitability for the processing with an (alkaline) aqueous developer as a preferred mode of processing the photosensitive layer of a lithographic printing plate precursor to which the present photosensitive composition is applied.
- the hydrophilic group of ester type has an advantage in that it has high compatibility in the photosensitive layer because of its comparatively hydrophobic structure, and besides, it produces an acidic group by hydrolysis in a developer to increase its hydrophilicity.
- various substituent groups can be introduced to the sensitizing dyes for the purpose of enhancing the compatibility and preventing the crystallization in the photosensitive layer.
- an unsaturated group such as an aryl or allyl group
- the introduction of a branched alkyl structure provides a steric hindrance between ⁇ -planes of the dye to effectively inhibit the dye from depositing as crystals.
- the introduction of a phosphonic acid group, an epoxy group or a trialkoxysilyl group can improve the adhesiveness to inorganic materials, such as metals and metal oxides.
- the methods of modifying the sensitizing dyes into polymeric ones can be employed depending on the desired purpose.
- sensitizing dyes can be set properly so as to realize the properties designed for the finished photosensitive material. More specifically, when the present photosensitive composition is used for the photosensitive layer of a lithographic printing plate precursor, the combined use of at least two kinds of sensitizing dyes can heighten the compatibility with other components in the photosensitive layer. In selecting sensitizing dyes, not only their sensitivities but also their molar extinction coefficients at the emission wavelengths of a light source constitute important factors.
- sensitizing dyes large in molar extinction coefficient can significantly lessen their addition amount, so it is economical, and besides, advantageous from the viewpoint of physical properties of the photosensitive layer.
- the sensitivity and resolution of the photosensitive layer and the physical properties of the exposed photosensitive layer are greatly influenced by the absorbance at the wavelengths of a light source used. Therefore, the addition amount of sensitizing dyes are properly chosen taking those factors into account. For instance, the low absorbance of 0.1 or below causes a sensitivity drop. And the halation occurs in such a low absorbance range to lower the resolution.
- such a low absorbance can rather increase the curing degree when the thick film having a thickness of at least 5 ⁇ m is cured.
- the high absorbance range of 3 or above on the other hand, most of incident light is absorbed at the surface of the photosensitive layer, and thereby the curing inside the photosensitive layer is impeded.
- the present photosensitive composition is used for a lithographic printing plate having a comparatively thin film thickness, it is desirable to determine the amount of sensitizing dyes added so that the absorbance of the photosensitive layer is in the range of from 0.1 to 1.5, preferably from 0.25 to 1.
- the sensitizing dyes are added to the photosensitive layer of a lithographic printing plate in an amount of generally from 0.05 to 30 parts, preferably from 0.1 to 20 parts, particularly preferably from 0.2 to 10 parts, per 100 parts of the total components in the photosensitive layer.
- the photosensitive layer of the plate precursor it is desirable for the photosensitive layer of the plate precursor to further contain a binder polymer.
- the binder polymer the linear organic high polymers are suitable. And any of known ones may be used herein. However, it is advantageous to select linear organic high polymers which are soluble or can swell in water or faintly alkaline water, because the development with water or faintly alkaline water becomes possible.
- These linear organic high polymers are used as film forming agent, but what kind of polymers should be used depends on the species of a developer used, in other words, which developer, water, faintly alkaline water or an organic solvent, is employed.
- linear organic high polymers include addition polymers having carboxylic acid groups in the side chains as disclosed, e.g., in JP-A-59-44615, JP-B-54-34327, JP-B-58-12577, JP-B-54-25957, JP-A-54-92723, JP-A-59-53836 and JP-A-59-71048, more specifically methacrylic acid copolymers, acrylic acid copolymers, itaconic acid copolymers, crotonic acid copolymers, maleic acid copolymers and partially esterified maleic acid copolymers.
- acidic cellulose derivative having carboxylic acid groups in the side chains.
- the hydroxyl group-containing addition polymers to which cyclic acid anhydrides are further added are also useful.
- the copolymers of benzyl (meth)acrylate, (meth)acrylic acid and, if needed, other addition polymerizable vinyl monomers are preferred in particular because they can ensure a good balance between film strength, sensitivity and developability.
- binder polymers of acidic group-containing urethane type as disclosed in JP-B-7-12004, JP-B-7-120041, JP-B-7-120042, JP-B-8-12424, JP-A-63-287944, JP-A-63-287947, JP-A-1-271741 and Japanese Patent Application No. 10-116232 are decidedly superior in film strength, so that they carry advantages in press life and low-intensity exposure suitability.
- amido group-containing binders disclosed in Japanese Patent Application No. 9-353195 can ensure both excellent developability and high film strength.
- water-soluble linear organic polymers include polyvinyl pyrrolidone and polyethyleneoxide.
- alcohol-soluble nylon and the polyether of 2,2-bis(4-hydroxyphenyl)propane and epichlorohydrin are well suited.
- These linear organic high polymers can be mixed in any amount in the total composition. So far as the image strength is concerned, however, desirable result cannot be brought about by mixing them in a proportion higher than 90 weight %. When the proportion is from 30 to 85 weight %, desirable results can be produced.
- the ratio between the photopolymerizable ethylenic unsaturated double bond-containing compounds and the linear organic high polymers be from 1/9 to 7/3 by weight.
- the binder polymers used are high polymers insoluble in water in a substantial sense but soluble in alkali. By the use of such high polymers, the developer can avoid being constituted of organic solvents undesirable from the environmental point of view, or the proportion of organic solvents therein can be drastically limited.
- the acid value (the acid content per g of polymer, expressed in chemical equivalent number) and the molecular weight of the binder polymer used are selected properly from the viewpoints of image strength and developability.
- the suitable acid value is from 0.4 to 3.0 meq/g, preferably from 0.6 to 2.0 meq/g
- the suitable molecular weight is from 3,000 to 500,000, prefeably from 10,000 to 300,000.
- the sensitivity of the present photosensitive composition can be further increased by using certain additives (hereinafter referred to as co-sensitizers).
- co-sensitizers certain additives
- the mechanism of such sensitization though not clear, can be supposed to be based on the following chemical processes in many cases. More specifically, it is supposed that new active radicals are produced by reacting the co-sensitizers with various intermediate active species (radicals, peroxides, oxidants, reductants) produced during the process of photo-reaction initiated by light absorption of the foregoing photo-initiation system and the addition polymerizing reaction subsequent thereto.
- co-sensitizers can be roughly classified into (a) compounds producing active radicals by reduction, (b) compounds producing active radicals by oxidation, and (c) compounds reacting with radicals having low activity to be converted into radicals having higher activity, or to act as chain transfer agent. In many cases, however, there is no common view as to which category each co-sensitizer belongs to.
- Active radicals are supposed to be produced by reductive cleavage of a carbon-halogen bond.
- trihalomethyl-s-triazines and trihalomethyloxadiazoles can be used appropriately.
- Active radicals are supposed to be produced by reductive cleavage of a nitrogen-nitrogen bond.
- hexaarylbiimidazoles can be used appropriately.
- Active radicals are supposed to be produced by reductive cleavage of oxygen-oxygen bond(s).
- organic peroxides can be used appropriately.
- Onium compounds Active radicals are supposed to be produced by reductive cleavage of a carbon-hetero atom bond or oxygen-nitrogen bond.
- diaryliodonium salts, triarylsulfonium salts and N-alkoxypyridinium (azinium) salts can be used appropriately.
- Ferrocenes and Iron-arene complexes Active radicals can be produced reductively.
- Alkyl-ato complexes Active radicals are supposed to be produced by oxidative cleavage of a carbon-hetero atom bond.
- triarylalkylborates can be used appropriately.
- Alkylamine compounds Active radicals are supposed to be produced by oxidative cleavage of a C-X bond on the carbon adjacent to the nitrogen.
- Suitable examples of X include a hydrogen atom, a carboxyl group, a trimethylsilyl group and a benzyl group.
- suitable examples of such compounds include ethanolamines, N-phenylglycines and N-trimethylsilylmethylanilines.
- Sulfur or tin-containing compounds The compounds containing sulfur or tin atoms in place of the nitrogen atoms in the alkylamine compounds recited above can produce active radicals by the similar action.
- the compounds having S-S bonds are also known to have sensitizing effect through the S-S bond cleavage.
- ⁇ -Substituted methylcarbonyl compounds Active radicals can be produced by oxidative cleavage of the bond between carbonyl and ⁇ -carbon.
- the compounds obtained by converting the foregoing carbonyl groups into oxime ethers have the similar action, too. Examples of such compounds include 2-alkyl-1-[4-(alkylthio)phenyl]-2-morpholinopropanones-1 and the oxime ethers prepared by reacting these compounds with hydroxyamines and then etherifying the N-OH therein.
- Suifinic acid salts These salts can produce active radicals by undergoing oxidation, with examples including sodium arylsulfinates.
- the compounds having SH, PH, SiH or GeH in each molecule can be used. These compounds can produce radicals by donating their hydrogen atoms to low active radicals, or by undergoing oxidation and subsequent proton removal. Examples of such compounds include 2-mercaptobenzimidazoles.
- the present photosensitive composition is used for the photosensitive layer of a lithographic printing plate precursor, in analogy with the sensitizing dyes as mentioned above, it is possible to introduce various chemical modifications to those co-sensitizers also for the purpose of improving characteristics of the photosensitive layer.
- such chemical modifications can be made to co-sensitizers by adopting a method of linking thereto a sensitizing dye part, an activator part or an addition polymerizable unsaturated compound part, a method of introducing thereinto a hydrophilic moiety, a substituent group for increasing the compatibility or controlling the deposition of crystals, or a substituent group for raising the adhesion, or a method of converting them into polymers.
- co-sensitizers as recited above can be used alone or as a combination of two or more thereof.
- the suitable amount of co-sensitizers used is from 0.05 to 100 parts by weight, preferably from 1 to 80 parts by weight, particularly preferably from 3 to 50 parts by weight, per 100 parts by weight of compound having at least one ethylenically unsaturated double bond.
- thermal polymerization inhibitor suitable for the foregoing purpose include hydroquinone, p-methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butylcatechol, benzoquinone, 4,4'-thiobis(3-methyl-6-t-butylphenol), 2,2'-methylenebis(4-methyl-6-t-butylphenol) and N-nitrosophenylhydroxyamine cerous salt.
- the suitable proportion of thermal polymerization inhibitors added is from about 0.01 to about 5 % by weight to the total composition. If it is needed to prevent the hindrance to polymerization by oxygen when the present photosensitive composition is used for the photosensitive layer of a lithographic printing plate precursor, higher fatty acids or derivatives thereof, such as behenic acid or behenic acid amide, may be added to the photosensitive composition and localized on the surface of the photosensitive layer during the drying process after coating the photosensitive layer.
- the suitable addition amount of higher fatty acids or derivatives thereof is from about 0.5 to about 10 % by weight to the total composition.
- the present photosensitive composition When used for the photosensitive layer of a lithographic printing plate precursor, dyes or pigments may further be added thereto for the purpose of coloring the photosensitive layer.
- the plate precursor By coloring the photosensitive layer, the plate precursor can provide improved visibility when made into the plate, and the so-called inspectability of the plate, such as suitability for image density measuring apparatus, can be enhanced. Since many of dyes causes a sensitivity drop in the photosensitive layer of photopolymerizable type, pigments are preferred in particular as coloring agent.
- Examples of a usable coloring agent include pigments, such as phthalocyanine pigments, azo pigments, carbon black and titanium oxide, and dyes, such as Ethyl Violet, Crystal Violet, azo dyes, anthraquinone dyes and cyanine dyes.
- the suitable proportion of dyes and pigments added is about 0.5 to about 5 % by weight to the total composition.
- the present photosensitive composition is used for the photosensitive layer of a lithographic printing plate precursor
- known additives such as inorganic fillers and plasticizers for improving the physical properties of the photosensitive layer as a cured film, and sensitizers for improving the ink receptivity of the photosensitive layer surface, can further be added thereto.
- plasticizers usable for such a purpose include dioctyl phthalate, didodecyl phthalate, triethylene glycol dicaprylate, dimethyl glycol phthalate, tricresyl phosphate, dioctyl adipate, dibutyl cebacate and triacetyl glycerin.
- plasticizers can be added in a proportion of at most 10 % by weight to the combination of the binder and the compound having at least one ethylenically unsaturated double bond.
- UV initiators and thermal cross-linking agents for intensifying the heating and exposing effects after development to increase the film strength (press life) of the photosensitive layer.
- the present photosensitive composition for the photosensitive layer of a lithographic printing plate precursor, it is also possible to add thereto additives for enhancing the adhesiveness of the photosensitive layer to the support and the removablity of the unexposed area of the photosensitive layer, and to provide an interlayer between the photosensitive layer and the support.
- additives for enhancing the adhesiveness of the photosensitive layer to the support and the removablity of the unexposed area of the photosensitive layer and to provide an interlayer between the photosensitive layer and the support.
- compounds having comparatively strong adhesiveness to the substrate such as a compound having the diazonium structure and a phosphono compound, can be added or formed into an undercoat, thereby improving the adhesiveness and extending press life.
- the addition or the undercoat of a hydrophilic polymer such as polyacrylic acid or polysulfonic acid, makes it possible to heighten the developability in the non-image area and to prevent scumming from developing.
- the composition is in advance dissolved in any of various organic solvents.
- organic solvent usable therein include acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, ethylene dichloride, tetragtdrifuran, toluene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycolmonoethyl ether, acetyl acetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate ethylene glycol ethyl ether acetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether acetate, 3-methoxypropanol, methoxymeth
- the coverage of the photosensitive layer on the support can affect chiefly the sensitivity and the developability of the photosensitive layer, and the film strength, or the press life, of the exposed photosensitive layer, so that it is desirable that the coverage be chosen properly depending on the use intended.
- the coverage is too scant, the adequate press life cannot be achieved; while, when it is too heavy, the sensitivity is lowered to require a long time for exposure, and besides, the time taken to perform development-processing becomes long.
- the suitable coverage of the photosensitive layer after drying is from about 0.1 g/m 2 to about 10 g/m 2 , preferably from 0.5 g/m 2 to 5 g/m 2 .
- the photosensitive layer be provided on a support having a hydrophilic surface.
- a support conventional hydrophilic supports known to be applicable to lithographic printing plates can be employed without any restrictions.
- the support suitably used herein is a dimensionally stable sheet-form material, with examples including paper, paper laminated with plastic (such as polyethylene, polypropylene, or polystyrene), a metal sheet (such as a sheet of aluminum, zinc, or copper), a plastic film (such as a film of cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose butyrate, cellulose acetate butyrate, cellulose nitrate, polyethylene terephthalate, polyethylene, polystyrene, polypropylene, polycarbonate, or polyvinyl acetal) and paper or a plastic film on which the metal as recited above is laminated or deposited.
- the surface of these supports each may be subjected to known physical and chemical treatments appropriate for conferring water wettability thereon and raising the strength thereof, if needed.
- the supports suitable in particular are paper, polyester film and aluminum sheet.
- the aluminum sheet is preferred over the others, because it has satisfactory dimensional stability, can get at a comparatively low price, and can provide highly hydrophilic and strong surface by adequate surface treatments.
- the composite sheet as disclosed in JP-B-48-18327, wherein an aluminum sheet is united with a polyethylene terephthalate film, is also used to advantage.
- the suitable aluminum sheets include a pure aluminum sheet and alloy sheets containing aluminum as a main component and very small amounts of foreign elements. Further, aluminum-laminated or deposited plastic films may be included therein. Examples of foreign elements contained in aluminum alloys include silicon, iron, manganese, copper, magnesium, chromium, zinc, bismuth, nickel, and titanium. The proportion of foreign elements in the alloy is at most 10 % by weight. Although the pure aluminum sheet is most desirable for applying the present composition thereto, the production of perfectly pure aluminum is difficult in view of the present smelting techniques. Such a being case, the aluminum sheet may contain trace amounts of foreign elements. Thus, the aluminum sheet to which the present photosensitive composition is applied has no particular restriction as to the composition, but hitherto known conventional aluminum sheets can be used.
- the suitable thickness of the aluminum sheet to which the present photosensitive composition is applied is from about 0.1 mm to about 0.6 mm, preferably from 0.15 mm to 0.4 mm, particularly preferably from 0.2 mm to 0.3 mm.
- the support has a metal surface, especially an aluminum surface
- a surface treatment such as a surface roughening (graining) treatment, an immersion treatment in an aqueous solution of sodium silicate, potassium fluorozirconate or phosphoric acid salts, or an anodic oxidation treatment.
- the surface roughening treatment for aluminum sheets can be carried out using various methods, such as the method of mechanically roughening the aluminum sheet surface, the method of roughening the aluminum sheet surface by electrochemical dissolution, and the method of chemically performing selective dissolution of the aluminum sheet surface.
- the mechanical method known methods including a ball abrasion method, a brush abrasion method, a blast abrasion method and a buff abrasion method can be adopted.
- the electrochemical method for surface roughening the method of performing AC or DC electrolysis in an electrolyte, such as hydrochloric acid or nitric acid, is usable. Also, as disclosed in JP-A-54-63902, the combination of both methods recited above can be utilized.
- the aluminum sheet surface may undergo degreasing treatment with, e.g., a surfactant, an organic solvent or an alkaline aqueous solution in order to remove the rolling oil from the sheet surface, if desired.
- a surfactant e.g., an organic solvent or an alkaline aqueous solution
- the aluminum sheet that has undergone immersion treatment in an aqueous solution of sodium silicate after its surface was roughened is used to advantage.
- the aluminum sheet that has undergone anodic oxidation treatment and then an immersion treatment in an aqueous solution of alkali metal silicate, as disclosed in JP-B-47-5125 is also favorable.
- the anodic oxidation treatment can be effected by sinking an aluminum sheet as anode into an electrolyte and passing current therethrough.
- aqueous or non-aqueous solutions of inorganic acids such as phosphoric acid, chromic acid, sulfuric acid and boric acid, organic acids, such as oxalic acid and sulfaminic acid, or salts thereof can be used alone or as combination of two or more thereof.
- JP-B-46-27481 JP-A-52-58602 and JP-A-52-30503
- a surface treatment as the combination of the foregoing anodic oxidation and sodium silicate treatments.
- JP-A-56-28893 it is also desirable to use the support subjected successively to mechanical surface roughening, chemical etching, electrolytic graining, anodic oxidation and treatment with sodium silicate.
- the support be provided with undercoating of a water-soluble resin, such as polyvinylphosphonic acid, a homo- or copolymer having sulfonic acid groups in its side chains or polyacrylic acid, a water-soluble metallic salt (e.g., zinc borate), a yellow dye or an amine salt.
- a water-soluble resin such as polyvinylphosphonic acid, a homo- or copolymer having sulfonic acid groups in its side chains or polyacrylic acid, a water-soluble metallic salt (e.g., zinc borate), a yellow dye or an amine salt.
- the substrate having undergone the sol-gel treatment as disclosed in JP-A-7-159983, to which functional groups capable of radically causing addition reaction are bonded covalently, can also be used to advantage.
- a support on which a waterproof hydrophilic layer is provided as its surface layer examples include the layer constituted of an inorganic pigment and a binder as disclosed in U.S. Patent 3,055,295 or JP-A-56-13168, the hydrophilic swelling layer disclosed in JP-A-9-80744, and the sol-gel film constituted of titanium oxide, polyvinyl alcohol and silicic acids as disclosed in JP-W-8-507727 (wherein the term "JP-W” as used herein means an "international patent application, published in its Japanese national proceeding").
- those water-receptivity imparting treatments are performed for prevention of a harmful reaction in the photosensitive composition applied to the support surface and elevation of adhesiveness to the photosensitive layer.
- the exposure is generally carried out in the atmosphere, and so it is desirable to further provide a protective layer on the layer of the photosensitive composition.
- the protective layer is provided for the purpose of preventing low molecular substances in the atmosphere, such as oxygen and basic substances, from invading into the photosensitive layer to avoid the inhibitory effect of such invaded substances upon the image forming reaction caused in the photosensitive layer by exposure, thereby enabling the exposure in the atmosphere.
- the characteristics required for such a protective layer are its high permeability barrier to low molecular substances, including oxygen, substantially no interference thereby in the transmission of exposure light, excellent adhesion to the photosensitive layer and easy removal thereof during the development processing subsequent to the exposure step.
- Various devices for meeting such requirements for the protective layer have so far been proposed. The detailed description thereof can be found in U.S. Patent 4,458,311 and JP-A-55-49729.
- the materials useful for the protective layer are, e.g., water-soluble high molecular compounds having comparatively high crystallinity.
- water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, acidic celluloses, gelatin, gum arabic and polyacrylic acid, are known.
- polyvinyl alcohol polyvinyl alcohol
- polyvinyl pyrrolidone polyvinyl pyrrolidone
- acidic celluloses such as gelatin, gum arabic and polyacrylic acid
- polyvinyl alcohol as the main component of the protective layer, partially esterified, etherified or acetalated polyvinyl alcohol may be employed instead of unmodified polyvinyl alcohol so far as the unmodified vinyl alcohol units contained therein are enough for providing necessary oxygen imperviousness and solubility in water.
- copolymerizing units may be contained as a part of polyvinyl alcohol. Specifically, it is desirable to use polyvinyl alcohol undergoing hydrolysis in a proportion of 71 to 100 % and having its molecular weight in the range of 300 to 2,400. Examples of such polyvinyl alcohol include the products of Kuraray Co., Ltd.
- PVA-105 PVA-110, PVA-117, PVA-117H, PVA-120, PVA-124, PVA-124H, PVA-CS, PVA-CST, PVA-HC, PVA-203, PVA-204, PVA-205, PVA-210, PVA-217, PVA-220, PVA-224, PVA-217EE, PVA-217E, PVA-220E, PVA-224E, PVA-405, PVA-420, PVA-613 and L-8.
- the components (species of PVA and additives) and the coverage of the protective layer are selected taking consideration of fogging tendency, adhesiveness and scratching resistance in addition to oxygen imperviousness and easiness of removal by development.
- the higher the hydrolysis rate of the PVA used (the proportion of unmodified vinyl alcohol units in the protective layer) and the greater the thickness of the protective layer the better the oxygen imperviousness, and so such situations have an advantage in sensitivity.
- too high oxygen imperviousness causes problems that unnecessary polymerization reactions occur during the production of the plate precursor or the storage thereof before platemaking operations and undesirable fogging and thickening phenomena occur at the time of image exposure.
- the adhesiveness of the protective layer to image areas and its scratching resistance are very important in handling the plate.
- Patents 292,501 and 44,563 describe that sufficient adhesion is achieved by laminating on an oleophilic polymerizing composition layer a hydrophilic layer containing 20 to 60 weight % of acrylic emulsion or water-insoluble copolymer of vinyl pyrrolidone in addition to hydrophilic polymers including polyvinyl alcohol. Any of those known arts can be applied to the protective layer of the lithographic printing plate precursor in which the present photosensitive composition is used. The coating methods applicable to the protective layer as mentioned above are described in detail in U.S. Patent 3,458,311 and JP-A-55-49729.
- the protective layer can have further enhanced darkroom safelight suitability without attended by a drop in sensitivity.
- the photosensitive material using the present photosensitive composition is employed as an image forming material
- the photosensitive material is subjected to imagewise exposure, and then the unexposed area thereof is removed with a developer to effect the image formation.
- a developer suitable for the case where the composition of the present invention is used for the preparation of a lithographic printing plate precursor include the developers disclosed in JP-B-57-7427, namely water solutions of inorganic alkali agents, such as sodium silicate, potassium silicate, sodium hydroxide, potassium hydroxide, lithium hydroxide, tertiary sodium phosphate, secondary sodium phosphate, tertiary ammonium phosphate, secondary ammonium phosphate, sodium metasilicate, sodium hydrogen carbonate and ammonia, and water solutions of organic alkali agents, such as ethanolamine and diethanolamine.
- These alkali agents are added to water so that the resulting alkaline solution has a concentration of 0.1 to 10 weight %, preferably 0.5 to 5 weight %.
- alkaline aqueous solutions can further contain small amounts of a surfactant and an organic solvent, such as benzyl alcohol, 2-phenoxyethanol or 2-butoxyethanol, if desired.
- a surfactant such as benzyl alcohol, 2-phenoxyethanol or 2-butoxyethanol
- an organic solvent such as benzyl alcohol, 2-phenoxyethanol or 2-butoxyethanol
- the whole surface of the plate precursor may be heated before exposure, during exposure and during a period from exposure to development, if needed.
- the image forming reaction in the photosensitive layer can be promoted to bring about the advantages of increasing the sensitivity, extending a press life and stabilizing the sensitivity. Further, it is effective for improvements of image strength and press life that the developed image is subjected to overall after-heating or overall exposure.
- the heating after development is carried out under a severe condition.
- the heating temperature is selected from the range of 200 to 500°C. The heating at a too low temperature cannot produce sufficient image strengthening effect, while the heating at a too high temperature causes deterioration of the support and pyrolysis in the image area.
- 11-15144 discloses the method in which the area information A (m 2 ) concerning the non-image part and the plate species information X are memorized in the control unit of an automatic processor and the developer is replenished in the amount determined by the following definition dependent on the memorized information, thereby greatly increasing the total area of plate materials processed while minimizing the volume of a developer used:
- Area-based replenisher volume (ml) in an automatic processor Area-based replenishment rate Rx (ml/m 2 ) x Area A (m 2 ) wherein Rx is a replenisher volume (ml) required for developing 1 m 2 of a plate species X having no image in its entirety.
- the lithographic printing plate precursor designed for scanning exposure wherein the present photosensitive composition is utilized
- known methods can be employed without any restriction.
- a light source the wavelengths of which are in the range of 350 nm to 450 nm, specifically InGaN semiconductor laser devices.
- the exposure mechanism may be any of an inside drum system, an outside drum system and a flatbed system.
- the photosensitive layer comprising the present photosensitive composition can be made soluble in neutral water or faintly alkaline water by using highly water-soluble ingredients therein, the lithographic printing plate precursor having such a constitution can also be processed using a system that the plate precursor is loaded on a printing press and subjected sequentially to exposure and development as it is loaded thereon.
- Examples of a gas laser device usable as the foregoing light source include Ar ion laser (354 nm, 351 nm, 10 mW to 1 W), Kr ion laser (356 nm, 351 nm, 10 mW to 1 W) and He-Cd laser (441 nm, 325 nm, 1 mW to 100 mW).
- Examples of a solid laser device usable as the foregoing light source include Nd: YAG(YVO 4 ) combined twice with an SHG crystal (355 nm, 5 mW to 1 W), and Cr:LiSAF combined with an SHG crystal (430 nm, 10 mW).
- Examples of a semiconductor laser device usable as the foregoing light source include a KNbO 3 ring resonator (430 nm, 30 mW), the combination of a waveguide-type wavelength changing element with AlGaAs and InGaAs semiconductors (380 to 450 nm, 5 mW to 100 mW), the combination of a waveguide-type wavelength changing element with AlGaInP and AlGaAs semiconductors (300 to 350 nm, 5 mW to 100 mW), and AlGaInN (350 to 450 nm, 5 mW to 30 mW).
- a KNbO 3 ring resonator 430 nm, 30 mW
- the combination of a waveguide-type wavelength changing element with AlGaAs and InGaAs semiconductors 380 to 450 nm, 5 mW to 100 mW
- the combination of a waveguide-type wavelength changing element with AlGaInP and AlGaAs semiconductors
- Examples of a pulse laser device usable as the foregoing light source include N 2 laser (337 nm, 0.1 to 10 mJ pulse), and XeF (351 nm, 10 to 250 mJ pulse).
- AlGaInN semiconductor laser (commercially available semiconductor laser of InGaN type, 400 to 410 nm, 5 to 30 mW) is advantageous over the others from the viewpoints of wavelength characteristics and cost.
- any of inside drum, outside drum and flatbed systems can be adopted as the exposure mechanism, and any of the laser devices recited above, except pulse laser devices, can be used as the light source.
- the exposure apparatus as described below is used to advantage in respect to the relation between the sensitivity and the platemaking time of the plate precursor.
- the single beam exposure apparatus using an inside drum system and one gas laser or solid laser light source the multi-beam exposure apparatus using a flatbed system and a number of (at least 10) semiconductor laser devices, and the multi-beam exposure apparatus using an outside drum system and a number of (at least 10) semiconductor laser devices are suitable for scanning exposure.
- the following equation (eq1) is generally set up between the plate precursor sensitivity X (J/cm 2 ), the exposed area S (cm 2 ) of the plate precursor, the power q (W) of one laser light source, the number n of laser beams and the total exposure time t (sec):
- X ⁇ S n ⁇ q ⁇ t
- Other light sources usable for exposure of the present photosensitive composition include ultrahigh-, high-, medium-and low-pressure mercury lamps, a chemical lamp, a carbon arc lamp, a xenon lamp, a metal halide lamp, various kinds of visible and UV laser lamps, a fluorescent lamp, a tungsten lamp and sun light.
- the present photocomposition can be applied to all things known to be the uses of photosetting resins.
- the application to a liquid photosensitive composition, if needed, combined with a cation polymerizable compound can provide a highly sensitive photo-molding material.
- the present photosensitive composition can be made into a hologram material by utilizing a change in refractive index caused by photopolymerization.
- the present photosensitive composition can also be applied to various transfer materials (photosensitive release materials, photosensitive materials for toner development) by utilizing a change in surface tackiness caused by photopolymerization.
- the present composition is also applicable to not only the photosetting of microcapsules, but also the preparation of electronic materials, such as photoresist, and photosetting resin materials, such as ink, paint and adhesive.
- the mixtures having the compositions shown in Table 1 were each dispersed for one hour at 45°C using a Dyno mill dispersing machine at 3000 r.p.m.
- the thus obtained dispersions were examined for their respective grain sizes by means of a laser scattering-utilized microtrack UPA granulometer (made by Nikkiso K.K.)
- Each dispersion was coated on a glass substrate so as to have a coating amount of 0.2 g/m 2 , and the transmittances thereof at 500 nm and 400 nm were compared with a spectrophotometer, UV-Visible Recording Spectrophotometer UV-260 (trade name, a product of Shimadzu Corporation). The results of these measurements are also shown in Table 1.
- Pigment dispersion Pigment (g) Polymer as dispersion medium (g) Solvent (g) Average grain size ( ⁇ m) Transmittance comparison PD1 P-25 (30) allylmethacrylate/methacrylic acid (83/17) copolymer weight average molecular weight: 10 ⁇ 10 4 (20) cyclohexanone (35) methoxypropyl acetate (115) 0.30 400nm >500 nm PD2 P-18 (30) allylmethacrylate/methacrylic acid (80/20) copolymer weight average molecular weight: 4 ⁇ 10 4 (20) cyclohexanone (35) methoxypropyl acetate (115) 0.13 400nm >500 nm PD3 P-26 (30) butylmethacrylate/methacrylic acid (80/20) copolymer weight average molecular weight: 15 ⁇ 10 4 (20) cyclohexanone (35) methoxypropyl acetate (115) 0.25 400nm >500 nm
- Pigment Blue 15:6 (30) allylmethacrylate/methacrylic acid (83/17) copolymer weight average molecular weight: 10 ⁇ 10 4 (20) cyclohexanone (35) methoxypropyl acetate (115) 0.20 500 nm >400 nm PD6 (comparison) P-27 (30) benzylmethacrylate/methacrylic acid (80/20) copolymer weight average molecular weight: 10 ⁇ 10 4 (20) cyclohexanone (35) methoxypropyl acetate (115) 0.90 500nm >400 nm
- a 0.30 mm-thick aluminum sheet was etched by 25-second dipping in a 10 weight % sodium hydroxide solution kept to 60°C, and then washed with running water, neutralized and cleaned with 20 weight % nitric acid, and further washed with water. Further, this aluminum sheet was immersed in 1 weight % aqueous nitric acid solution and subjected to electrolytic surface roughening treatment using sine-wave alternating waveform current under the anodic electricity of 300 coulomb/dm 2 .
- the aluminum sheet was dipped in 1 weight % aqueous sodium hydroxide solution for 5 seconds at 40°C, and then immersed in a 30 weight % aqueous sulfuric acid solution for 40 seconds at 60°C to effect desmutting treatment. Further, the thus treated aluminum sheet underwent 2-minute anodic oxidation treatment in a 20 weight % aqueous sulfuric acid solution under the current density of 2 A/dm 2 to form an anodic oxidation film of 2.7g/m 2 at the surface. The surface roughness of the thus treated aluminum sheet was found to be 0.3 ⁇ m (expressed in terms of Ra according to JIS B0601).
- the following sol-gel reaction solution was coated with a bar coater, and dried for 1 minute at 100°C to form a support provided with a backing coat having a dry coating amount of 70 mg/m 2 .
- the photosensitive composition containing the following ingredients was coated so as to have a dry coating amount of from 1.0 to 2.0 g/m 2 , and dried for 2 minutes at 80°C, thereby forming a photosensitive layer: Pentaerythritol tetraacrylate 1.5 g Benzyl methacrylatae/methacrylic acid (75/25 by mole) copolymer 2.0 g Photopolymerization initiator (shown in Table 2) Sensitizing dye (content set forth in Table 2) Titanocene compound (content set forth in Table 2) Fluorine-containing nonionic surfactant (F-177) 0.03 g N-Nitrosophenylhydroxylamine aluminum salt (thermopolymerization inhibitor) 0.01 g Pigment dispersion (shown in Table 2) (content set forth in Table 2) Methyl ethyl ketone 20 g Propylene glycol monomethyl ether 20 g
- a 3 weight % aqueous solution of polyvinyl alcohol (saponification degree: 98mole %, polymerization degree: 550) was coated so as to have a dry coating amount of 2 g/m 2 , and then dried for 2 minutes at 100°C.
- Each of the thus produced lithographic printing plate precursors was brought into close contact with a Fuji Stepguide made by Fuji Photo Film Co., Ltd. (a gray scale having a series of transmission optical densities changed discontinuously by 0.15 as ⁇ D), and exposed to a xenon lamp via an optical filter so that the fixed exposure energy was applied thereto. Then, each plate precursor was developed by 10-second immersion in a 25°C developer having the composition described below. The maximum of step numbers corresponding to the complete removal of images was read, and thereby the quantity of energy exposed was determined and the sensitivity (unit: mJ/cm 2 ) was calculated therefrom. The smaller the energy quantity thus determined, the higher the sensitivity of the plate precursor.
- the exposure to 400 nm monochromic light through an optical filter, Kenko BP-40 was also carried out. Further, the imagewise exposure-free plate precursor was exposed to a yellow lamp under an illumination of 200 lux over a period of 1 hour, and then developed in the same manner as mentioned above. When the thus developed plate precursor had a film residue, the fogging characteristic was regarded no good (NG). Furthermore, the absorbance of each plate precursor at 500 nm was determined in accordance with a diffuse reflection measuring method, wherein a spectrophotometer (UV-Visible Recording Spectrophotometer UV-260, made by Shimadzu Corporation) was used.
- a spectrophotometer UV-Visible Recording Spectrophotometer UV-260, made by Shimadzu Corporation
- sensitizing dyes D1 to D3 set forth in Table 2 are those illustrated in the Detailed Description section of this specification, the pigment dispersions are those set forth in the foregoing Table 1, and the structures of the titanocene compounds used herein are illustrated hereinafter.
- the lithographic printing plate precursors comprising the present photosensitive compositions had excellent characteristics that their sensitivities to scanning exposure were sufficiently high and they generated no fog under a yellow lamp.
- the plate precursor free of the present pigment was inferior in fogging characteristic.
- the plate precursors using the pigments whose optical characteristic was their smaller transmittance at 400 nm than at 500 nm had markedly low sensitivity (Comparative Examples 3 to 4) or insufficient improvement in fogging characteristic (Comparative Example 2).
- Lithographic printing plate precursors were prepared and further converted into lithographic printing plates in accordance with the following procedures, and the printing properties of the thus made lithographic printing plates were evaluated. The results obtained are shown in Table 3.
- the surface of a 0.30 mm-thick aluminum sheet (1S material) was grained using a nylon brush No. 8 and a 800-mesh pumice stone-water suspension, and then washed thoroughly with water.
- This sheet was etched by 60-second immersion in a 10 weight % aqueous solution of sodium hydroxide kept to 70°C, washed with running water, neutralized and cleaned with 20 weight % nitric acid, and further washed with water.
- the aluminum sheet was immersed in a 1 weight % aqueous solution of nitric acid, and subjected to electrolytic surface roughening treatment using sine-wave alternating waveform current under the condition that V A was 12.7 V and the anodic electricity was 300 coulomb/dm 2 .
- the surface roughness of the thus treated aluminum sheet was found to be 0.45 ⁇ m (expressed in terms of Ra according to JIS B0601).
- the foregoing support was immersed in a 2.5 weight %, pH 11.2, 70°C aqueous solution of sodium silicate No. 3 (SiO 2 : 28-30 %, Na 2 O: 9-10 %, Fe: less than 0.02 %) for 13 seconds, and then washed with water.
- the silicate coverage on the support surface was calculated to be 10 mg/m 2 from the amount of Si element determined by the fluorescent X-ray analysis of the surface.
- the coating Solution A having the following composition was prepared, and applied to the foregoing hydrophilic support surface so as to have a phenylphosphonic acid coating amount of 20 mg/m 2 by using whirler at 180 r.p.m., and then dried for 30 seconds at 80°C.
- Phenylphosphonic acid 0.07-1.4 g Methanol 200 g
- the photosensitive solution having the following composition was prepared, and coated on the foregoing interlayer so as to have a coating amount of from 1.0 to 2.0 g/m 2 by means of a whirler, and dried for 1 minute at 100°C.
- Addition polymerizable compound (Compound as set forth in Table 3) 1.5 g Binder polymer (Compound as set forth in Table 3) 2.0 g Sensitizing dye (Compound as set forth in Table 3) 0.1 g Activator (Compound as set forth in Table 3) 0.1 g Cosensitizer (Compound as set forth in Table 3) 0.3 g Pigment dispersion (Compound as set forth in Table 3) 2.0 g Thermopolymerization inhibitor (N-nitrosophenylhydroxylamine aluminum salt) 0.01 g Surfactant (Megafac F-177, trade name, a product of Dai-Nippon Ink & Chemicals Inc.) 0.02 g Methyl ethyl ketone 20.0 g Propylene glycol monomethyl ether 20.0 g
- a 3 weight % aqeuous solution of polyvinyl alcohol (saponification degree: 98 moel %, polymerization degree: 550) was coated so as to have a dry coating amount of 2 g/m 2 , and then dried for 2 minutes at 100°C.
- the thus prepared lithographic printing plate precursors were each exposed imagewise by using monochromatic light of 400 nm as a light source under a condition that the exposure powder was controlled so as to have the exposure energy density of 150 ⁇ J/cm 2 at the plate surface.
- the image areas are eluted in the development step, or the plates made therefrom cannot have a satisfactory long press life.
- the plate precursors were each exposed in advance to a yellow lamp of 400 lux for 30 minutes, and then subjected to the same image exposure as mentioned above.
- NG no good
- the printing press used was R201 made by Rohland Co., and the printing ink used was GEOS-G(N) produced by Dai-Nippon Ink & Chemicals, Inc.
- the solid image areas printed on sheets were observed as to whether or not they were uniform all over in density, and the number of printed sheets obtained before the solid image area failed to have uniform density all over was adopted as the standard for a press life. Therefore, the greater the number, the longer the press life.
- the printing press used was R201 made by Rohland Co., and the printing ink used was GEOS-G(N) produced by Dai-Nippon Ink & Chemicals, Inc.
- the non-image areas (unexposed areas) of printed sheets were observed for evaluation of scumming characteristic.
- the lithographic printing plate precursors using the present photosensitive compositions provided lithographic printing plates of high quality even when they were subjected to scanning exposure of very low energy, namely the exposure under the condition enabling the platemaking with high productivity. Further, these plate precursors had safelight suitability to enable the work under a yellow lamp.
- the photosensitive composition comprises a titanocene compound and a pigment having an optical characteristic that the transmittance at 500 nm is relatively lower than the transmittance at 400 nm, and thereby the composition can have sufficiently high sensitivity to light of short wavelengths and no fog under a yellow lamp.
- the application of the present photosensitive composition to a photosensitive recording material enables the recording material to have sensitivity well suited for scanning exposure with s short-wavelength semiconductor laser device, such as InGaN, and handling suitability under a yellow lamp.
- the invention can provide a lithographic printing plate precursor having suitability for scanning exposure and ensuring a long press life, good scumming characteristic and high stability for the printing plate.
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Materials For Photolithography (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Polymerisation Methods In General (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20982299 | 1999-07-23 | ||
JP11209822A JP2001033961A (ja) | 1999-07-23 | 1999-07-23 | 感光性組成物および平版印刷版の製版方法 |
Publications (2)
Publication Number | Publication Date |
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EP1070990A1 true EP1070990A1 (fr) | 2001-01-24 |
EP1070990B1 EP1070990B1 (fr) | 2007-04-25 |
Family
ID=16579199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00115002A Expired - Lifetime EP1070990B1 (fr) | 1999-07-23 | 2000-07-21 | Précurseur de plaque d'impression lithographique et procédé de fabrication d'une plaque d'impression lithographique |
Country Status (5)
Country | Link |
---|---|
US (1) | US6423471B1 (fr) |
EP (1) | EP1070990B1 (fr) |
JP (1) | JP2001033961A (fr) |
AT (1) | ATE360838T1 (fr) |
DE (1) | DE60034515T2 (fr) |
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EP1172699A1 (fr) * | 2000-07-14 | 2002-01-16 | Fuji Photo Film Co., Ltd. | Solution de développement, procédé pour la fabrication des plaques lithographiques et plaque d'impréssion lithographique photosensible |
EP1262829A1 (fr) * | 2001-05-28 | 2002-12-04 | Fuji Photo Film Co., Ltd. | Composition photosensible |
EP1273971A2 (fr) * | 2001-07-05 | 2003-01-08 | Fuji Photo Film Co., Ltd. | Procédé pour la photopolymerisation par irradiation d une plaque d impression lithographique |
EP1273972A1 (fr) * | 2001-07-04 | 2003-01-08 | Fuji Photo Film Co., Ltd. | Dévelopateur pour plaque présensibilisée photopolymerizable, utilisation du dévelopateur dans la fabrication de plaques d'impressions lithographiques et procédé de fabrication de ces plaques |
EP1296187A2 (fr) * | 2001-09-21 | 2003-03-26 | Fuji Photo Film Co., Ltd. | Plaque lithographique photopolymerisable |
US6706462B2 (en) * | 2000-04-18 | 2004-03-16 | Fuji Photo Film Co., Ltd. | Photosensitive image-recording material |
EP1510865A2 (fr) * | 2003-08-28 | 2005-03-02 | Fuji Photo Film Co., Ltd. | Composition photopolymérisable et procédé d'enregistrement d'images |
WO2006007581A2 (fr) * | 2004-07-01 | 2006-01-19 | Eastman Kodak Company | Imagerie de plaque d'impression sensible au violet |
EP1757981A1 (fr) | 2005-08-26 | 2007-02-28 | Agfa Graphics N.V. | Précurseur de plaque d'impression photopolymère |
US7241557B2 (en) | 2004-07-30 | 2007-07-10 | Agfa Graphics Nv | Photopolymerizable composition |
EP1882585A1 (fr) * | 2006-07-25 | 2008-01-30 | FUJIFILM Corporation | Précurseur de plaque d'impression lithographique et procédé pour la préparation d'une plaque d'impression lithographique |
US7527916B2 (en) | 2003-09-22 | 2009-05-05 | Agfa Graphics, N.V. | Photopolymerizable composition |
WO2010093413A1 (fr) | 2009-02-13 | 2010-08-19 | Eastman Kodak Company | Eléments négatifs pouvant être imagés |
US8114569B2 (en) | 2006-05-30 | 2012-02-14 | Photocentric Limited | Maskless photopolymer exposure process and apparatus |
US8445176B2 (en) | 2007-05-25 | 2013-05-21 | Agfa Graphics Nv | Lithographic printing plate precursor |
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CN1169680C (zh) * | 2000-05-15 | 2004-10-06 | 富士胶片株式会社 | 平版印刷印版的支持体和感光性树脂平版 |
JP2002244290A (ja) * | 2001-02-16 | 2002-08-30 | Mitsubishi Chemicals Corp | 光重合性組成物 |
US7125467B2 (en) * | 2003-06-30 | 2006-10-24 | Hitachi Global Storage Technologies Netherlands B.V. | Slider processing system utilizing polyvinyl alcohol release layer |
US20050153239A1 (en) * | 2004-01-09 | 2005-07-14 | Fuji Photo Film Co., Ltd. | Lithographic printing plate precursor and lithographic printing method using the same |
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US20080271627A1 (en) * | 2005-02-14 | 2008-11-06 | Gary Ganghui Teng | Lithographic printing press and method for on-press imaging laser sensitive lithographic plate |
US20070095232A1 (en) * | 2005-02-14 | 2007-05-03 | Teng Gary G | Lithographic printing press and method for on-press imaging lithographic printing plate |
US20070289468A1 (en) * | 2006-06-14 | 2007-12-20 | Gary Ganghui Teng | On-press imaging lithographic printing press and method |
EP1910897A4 (fr) | 2005-07-29 | 2010-12-22 | Anocoil Corp | Plaque d'impression pouvant etre imagee pour developpement sur presse |
JP4815270B2 (ja) * | 2005-08-18 | 2011-11-16 | 富士フイルム株式会社 | 平版印刷版の作製方法及び作製装置 |
US7348132B2 (en) * | 2006-01-21 | 2008-03-25 | Gary Ganghui Teng | Laser sensitive lithographic printing plate having specific photopolymer composition |
US7524615B2 (en) * | 2006-08-14 | 2009-04-28 | Gary Ganghui Teng | Negative laser sensitive lithographic printing plate having specific photosensitive composition |
JP4934386B2 (ja) * | 2006-09-29 | 2012-05-16 | 富士フイルム株式会社 | 光重合型感光性平版印刷版原版 |
WO2009028324A1 (fr) * | 2007-08-30 | 2009-03-05 | Konica Minolta Medical & Graphic, Inc. | Plaque d'impression lithographique photosensible |
JP4914864B2 (ja) * | 2008-03-31 | 2012-04-11 | 富士フイルム株式会社 | 平版印刷版の作製方法 |
US20100147173A1 (en) * | 2008-12-15 | 2010-06-17 | Gary Ganghui Teng | On-press development of lithographic plate utilizing plate holder for exposed plate |
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EP0723167A2 (fr) * | 1995-01-17 | 1996-07-24 | Mitsubishi Chemical Corporation | Composition photopolymérisable pour filtre chromatique |
US5776996A (en) * | 1996-02-29 | 1998-07-07 | Fuji Photo Film Co., Ltd. | Photopolymerizable composition |
JPH10186654A (ja) * | 1996-12-26 | 1998-07-14 | Hitachi Chem Co Ltd | 感光性組成物、感光材料、レリーフパターンの製造法及びポリイミドパターンの製造法 |
EP0924570A1 (fr) * | 1997-12-15 | 1999-06-23 | Fuji Photo Film Co., Ltd. | Composition photopolymérisable |
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US5800965A (en) * | 1996-02-29 | 1998-09-01 | Mitsubishi Chemical Corporation | Photopolymerizable composition for a photosensitive lithographic printing plate and photosensitive lithographic printing plate employing it |
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1999
- 1999-07-23 JP JP11209822A patent/JP2001033961A/ja not_active Abandoned
-
2000
- 2000-07-20 US US09/620,990 patent/US6423471B1/en not_active Expired - Fee Related
- 2000-07-21 EP EP00115002A patent/EP1070990B1/fr not_active Expired - Lifetime
- 2000-07-21 AT AT00115002T patent/ATE360838T1/de not_active IP Right Cessation
- 2000-07-21 DE DE60034515T patent/DE60034515T2/de not_active Expired - Lifetime
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EP0723167A2 (fr) * | 1995-01-17 | 1996-07-24 | Mitsubishi Chemical Corporation | Composition photopolymérisable pour filtre chromatique |
US5776996A (en) * | 1996-02-29 | 1998-07-07 | Fuji Photo Film Co., Ltd. | Photopolymerizable composition |
JPH10186654A (ja) * | 1996-12-26 | 1998-07-14 | Hitachi Chem Co Ltd | 感光性組成物、感光材料、レリーフパターンの製造法及びポリイミドパターンの製造法 |
EP0924570A1 (fr) * | 1997-12-15 | 1999-06-23 | Fuji Photo Film Co., Ltd. | Composition photopolymérisable |
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US6706462B2 (en) * | 2000-04-18 | 2004-03-16 | Fuji Photo Film Co., Ltd. | Photosensitive image-recording material |
US6686126B2 (en) | 2000-07-14 | 2004-02-03 | Fuji Photo Film Co., Ltd. | Developing solution for photosensitive lithographic printing plate, plate-making method of lithographic printing plate, and photosensitive lithographic printing plate |
EP1172699A1 (fr) * | 2000-07-14 | 2002-01-16 | Fuji Photo Film Co., Ltd. | Solution de développement, procédé pour la fabrication des plaques lithographiques et plaque d'impréssion lithographique photosensible |
EP1262829A1 (fr) * | 2001-05-28 | 2002-12-04 | Fuji Photo Film Co., Ltd. | Composition photosensible |
US6878505B2 (en) | 2001-05-28 | 2005-04-12 | Fuji Photo Film Co., Ltd. | Photosensitive composition |
EP1273972A1 (fr) * | 2001-07-04 | 2003-01-08 | Fuji Photo Film Co., Ltd. | Dévelopateur pour plaque présensibilisée photopolymerizable, utilisation du dévelopateur dans la fabrication de plaques d'impressions lithographiques et procédé de fabrication de ces plaques |
US6641980B2 (en) | 2001-07-04 | 2003-11-04 | Fuji Photo Film Co., Ltd. | Developer for photopolymerizable presensitized plate for use in making lithographic printing plate and method for preparing lithographic printing plate |
EP1273971A3 (fr) * | 2001-07-05 | 2003-10-22 | Fuji Photo Film Co., Ltd. | Procédé pour la photopolymerisation par irradiation d une plaque d impression lithographique |
US6811952B2 (en) | 2001-07-05 | 2004-11-02 | Fuji Photo Film Co., Ltd. | Process for photopolymerization of photosensitive lithographic printing plate |
EP1273971A2 (fr) * | 2001-07-05 | 2003-01-08 | Fuji Photo Film Co., Ltd. | Procédé pour la photopolymerisation par irradiation d une plaque d impression lithographique |
EP1296187A3 (fr) * | 2001-09-21 | 2003-10-22 | Fuji Photo Film Co., Ltd. | Plaque lithographique photopolymerisable |
EP1296187A2 (fr) * | 2001-09-21 | 2003-03-26 | Fuji Photo Film Co., Ltd. | Plaque lithographique photopolymerisable |
EP1510865A2 (fr) * | 2003-08-28 | 2005-03-02 | Fuji Photo Film Co., Ltd. | Composition photopolymérisable et procédé d'enregistrement d'images |
EP1510865A3 (fr) * | 2003-08-28 | 2006-06-07 | Fuji Photo Film Co., Ltd. | Composition photopolymérisable et procédé d'enregistrement d'images |
US7527916B2 (en) | 2003-09-22 | 2009-05-05 | Agfa Graphics, N.V. | Photopolymerizable composition |
WO2006007581A3 (fr) * | 2004-07-01 | 2006-05-18 | Eastman Kodak Co | Imagerie de plaque d'impression sensible au violet |
WO2006007581A2 (fr) * | 2004-07-01 | 2006-01-19 | Eastman Kodak Company | Imagerie de plaque d'impression sensible au violet |
US7241557B2 (en) | 2004-07-30 | 2007-07-10 | Agfa Graphics Nv | Photopolymerizable composition |
WO2007023133A2 (fr) * | 2005-08-26 | 2007-03-01 | Agfa-Graphics N.V. | Precurseur de plaque d'impression photopolymere |
WO2007023133A3 (fr) * | 2005-08-26 | 2007-11-08 | Agfa Graphics Nv | Precurseur de plaque d'impression photopolymere |
EP1757981A1 (fr) | 2005-08-26 | 2007-02-28 | Agfa Graphics N.V. | Précurseur de plaque d'impression photopolymère |
CN101253450B (zh) * | 2005-08-26 | 2014-10-22 | 爱克发印艺公司 | 光致聚合物印刷版前体 |
US8114569B2 (en) | 2006-05-30 | 2012-02-14 | Photocentric Limited | Maskless photopolymer exposure process and apparatus |
EP1882585A1 (fr) * | 2006-07-25 | 2008-01-30 | FUJIFILM Corporation | Précurseur de plaque d'impression lithographique et procédé pour la préparation d'une plaque d'impression lithographique |
US8221959B2 (en) | 2006-07-25 | 2012-07-17 | Fujifilm Corporation | Lithographic printing plate precursor and method for preparation of lithographic printing plate |
US8445176B2 (en) | 2007-05-25 | 2013-05-21 | Agfa Graphics Nv | Lithographic printing plate precursor |
WO2010093413A1 (fr) | 2009-02-13 | 2010-08-19 | Eastman Kodak Company | Eléments négatifs pouvant être imagés |
US8034538B2 (en) | 2009-02-13 | 2011-10-11 | Eastman Kodak Company | Negative-working imageable elements |
Also Published As
Publication number | Publication date |
---|---|
EP1070990B1 (fr) | 2007-04-25 |
DE60034515T2 (de) | 2007-12-27 |
DE60034515D1 (de) | 2007-06-06 |
JP2001033961A (ja) | 2001-02-09 |
ATE360838T1 (de) | 2007-05-15 |
US6423471B1 (en) | 2002-07-23 |
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